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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe540d1c9ae54f2d8fc32e2a48a535dedb68593c02942a7578aafd861665d6e' 
  AND token = '08urKhhod+96t/JErefy32W7mcEgJ7umya/i+9FG+YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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