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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ea3c0e19b7eaae33ea6cea7cb192fcda681b7909e462e1ac15e41f9fd3f396' 
  AND token = 'VeqdYLQE1R2sByemfDmQHidXi9vlQYJlCNwswwlyRB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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