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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9a9be0ef2cbed7f45339c68f5af735d3539d3532b3f078ce9b32b82242fcee' 
  AND token = '1M1fHFYooYvF4uihtExyXdX6ER9TG6WkxyIvPgokQwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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