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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298b08f68cb1285befb13e7ae43e8e8998e1f5dda1f3aace815981d715c15ea6' 
  AND token = 'ugFYTTMWeQVm5aAuTpHpsUFg8EmsUjZWHbYswtcl+XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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