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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e57d8cc4b5f750afcfea2e0fccfae99962f2d3726fd334346f3d3b2ac5bf594' 
  AND token = '0JGaYiMlDZic45CfI5k25eFJYcIDGiQ9LG17wvxyhxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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