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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b89d5ee70b913ab652e1d9b9d3188339a2b957fbebf22ddf62060b96592bea8' 
  AND token = 'GjycsGi0Vn5cTspK98bS9TiNQ3qwXqM3+a5HwlkQJcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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