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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7ff1b5f2dfaac7a9c5713e57fe101c9eec8b6c9dafbdbd00e211fdc5082e47' 
  AND token = 'J3MVQ8kCJxfnhXjF0qYgLmctoubOz4rufDycEJj2P/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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