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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db1e39161e71b96927f104896fb10e0251ccd9e9a0d971a8879dd78898c85a4' 
  AND token = 'gx7NCUhr6jJqFIMwJHe8GA99/7vKhvahyoD4bYzcT0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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