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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892c3cccfba541591149ccdbedbd8f76f8361d37f6fd5843b03c7fbd116c325c' 
  AND token = 'a45Qp3h4fdjNTL7ZaHoqu8sKM0x8vIzNLPqLnQWsn6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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