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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a067d4d4bba26dd9a1e93e1d2b8eb2c98c0fb7e7a9c518bc9eb05324df664a6' 
  AND token = 'boJtwUwstsZx5L2NnA+0CBQQZ1Urea5gLqKWvCU9/bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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