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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb6923b589d6a31c880e3d21f25935f90585edd68f33d361037df270573ae7e' 
  AND token = '+1LNQz1sJeIiu/DW7NE+j3tCz8kSxJleuXXCqmcftRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}