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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ab5df6925dba6fb9be2e1f62722adca33178c6e6ccca2b7703f203c0b59134' 
  AND token = 'cceGhm02ntBsPbJ1M3oYe/NaRKvyt+vyJ9LwOdFbDbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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