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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd446aa699dde60ea7b98f943671bf111d8baae197d3a97b4f959fec1e0667b30' 
  AND token = 'lxBGVkins6r7uoWNMqL2jEBjOrePySIvTSS3YR9UBgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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