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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f50233e7c0eac9580bc0d2bde579e9fcc0a92bc45b885121236b40e34a580e3' 
  AND token = 'v5gYi1WgSjxT2z5n3QrseFVHOTksht9Vhh8wV83V5wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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