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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e3551322827351533d5b6ed9eeb3089cb80710ce2c6caa19e85c62565812d8' 
  AND token = 'tczQCxWGjf5V3dGqKnguc/oveWc9ZyzqoatOhU5YfIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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