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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f141ee70841e28e6bf334ed98c8c9db751c5a9a13e92bcf3090859ebafbc7990' 
  AND token = 'WToo6OVjyfa+y6FFlKwNXGEJluYZBdTX+j6kkQ598V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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