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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3abb6e604d824f0ae7d2a5ba2c97167787b07ad11fc629caca036d61b819b6' 
  AND token = 'WZNg7/Ir7shVNOeLFQVswkDU3H6yuofxAYMEsk1gUcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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