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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fa655b1a4c6aaf8a0ec3ed7b9ca3268ed628ef0afdec881e53aca0cb98296e' 
  AND token = 'cA1kdtC+oZdnWmnOR3SfDpmUMFzK1hREGs8peIRZIsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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