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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1062c3b8ad98a3f705d87ac7722e41c55c4db5f68f603840c4faeba5a5d22c' 
  AND token = 'QyUng5WYX+46/vZbP50aOSVq0VtLVu+LeY+1pGf0KXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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