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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2eafd5a9738abb8befc6b3ac8eb03fa23437057200d54d11eeadff46d4b8e6e' 
  AND token = '1pH6dui2Xe0wQK4iBPZbZfJrB/7o1zNTUuCbveJTUcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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