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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4954c207c2e456a04fb61c74e8fb9735fdc004d917bd701b01ca4e4c6e137da7' 
  AND token = 'c6TojHSeMJx1OSDd6RRXNMN81y/Qyyicik7t/kVaOqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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