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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee01fc8046593cc7c03e5929f8cda610e1b59d447623eb8cd9f5bfada94c4428' 
  AND token = 'cRDoWqbAP9r0A1NVYp0td2qg/eJ/rtEHTn19HdlaP9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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