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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d92652d0e1cd6848f9983eb1b41f6b2d18be0e1114fe0caa95017954c19461b' 
  AND token = 'NV83L02psCLe9wwNF0EqbFd0g7IRi1o4RNVlUHYqjVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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