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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908615037738d46bc593b5045a4b0eb2420c113b255f67ccb3593b490bc284ee' 
  AND token = '4YdXk1B3PD5vYXGGdZnmm/j3gn3CcooKtDc3Lp6lEyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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