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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2ba3441cf130e7c961d72bba3fb9d05578cbf65805ebe9eb79f1668a989e74' 
  AND token = '6MEAcP6WKKWOvONVMtF6YnIrEEQTTe+IM1jF8fVoSb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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