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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9fd762b7dc250975f72752a112db45effbe0ee6b7e4b3eb5cce8dc4f703927' 
  AND token = 'Z0cpFSbVwBTcmgdfy+UqQVVTKmpfAZoqcR9aXOHm78Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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