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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d23aea88d1bd90bac497edf50fa3986e7f282e7ec439d5ff5b94fbf784f2d8' 
  AND token = '4vAub4+V/lqsjwqjqdCjry8eUGXvhK5z08M6Xz8koi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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