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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bde932030f8bce0b9ec93798d75059306270b2d6a7fab9542dffb6d0f752bd2' 
  AND token = 'r0XEIY2OOHXKXzm8GbqrWEKPmvbt7TjH5fmKJY7wx+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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