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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b227b9fc3eea150374a17a60324eac2725647b076b5d7268f6df0a6ad3fed5' 
  AND token = 'DsJWszydIIeln46n+NYU80UEwvTrKaUXrEKyY5Tk4LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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