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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca241c9e13eacb6af0a57b7d715e8f633a5135ee9606c842fadb67738cccd488' 
  AND token = 'bOq0I7KfzKIhxIlMeNpJrD7b6ucQFggOKHeXZ0RA8Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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