Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e6ae0238514bd8c7c3fbb06a6d1ad0a8170b75e427ef8e95c1579b88d37994' 
  AND token = '3bLSqwwGA5yV8rTKLHMBhAsoo1RchM85EEExUlV0ny0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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