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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148ce99fd26486d4864ef99bc5a376bbf1e534ea0cb8436afe880d5dbadb467c' 
  AND token = 'wBxZmdecokhUEQlhtsm3XtLzmFcZY+Q/tegsy9ZgqU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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