Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76668292ad12335e301593e304f27d1cf8e0404650447efe25ee55ae02b92f3' 
  AND token = 'bcXbdYSBESOfJyH89bMMyxRKtHEP/OiG2SWa+u1s2CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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