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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdc9e5b8073257e4b84411015978ac84537886f7467c32fd83279484812f4e4' 
  AND token = 'DJ74rj4tWOVC715Ecp0f/AC6VVKO0XGx6DdJUTH4jrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00270

JSON explain

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