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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a9f4cb2874cdaf7ccbe12b82b1defe017f68d2ba0660daa821cf9d30d6e709' 
  AND token = 'LRKxM9IuxB7TWpO+O8Z2SA3Z6IEg9d0qxPghDyBFM9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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