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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a35e87e59e7ae4d9dc56542852320ceaabcf3c564a1da275c5666deab428764' 
  AND token = 'xUCBpHBrO/XxAFFQboK2kR+KvLagqjZER1qx3bx4qDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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