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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad240d026e430a8e62a345a4c125d7158cacf81078adc18812d0018c3e35624' 
  AND token = '/L9to+uKgCmX4f44Qh2VK5HM5AKznYKlFwM75upe97s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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