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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89c6e708cceaa4bf9ca963b5e1d4e1a63aed91aa8cbdc20410a5ddf29cccbc6' 
  AND token = 'gfS335Eg1nP4pPdD918Rqu1CH97fUZeTF6A26z7UIf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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