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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92807dc80cc95d2ddd5c0d56291f763a55978ed13fec1998e1b0578d03896c89' 
  AND token = 'mQOUgQ0bgXafiafrMyxZPECWDS3o2afE6TlIfbGXiHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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