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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902552fbf48de6b9816a1732a830d4b66333a1634c7c16ec569c55366ff39659' 
  AND token = 'XH7NKHzyo/c4HUuVmkxZ92VRrohDeNYeR4AhvkhXiz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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