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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04083e006ecb0ddd74c20c7057f50098145dbe8566699bab958f116e326a964b' 
  AND token = 'RX7bsRdQn3LZiPn0aiNuY/g7/sbV4Nmjq+w1aNxdoa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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