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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3411fb0ae38fd5730510413771f3b2062a9c14aa35a3be789f86dcee1c9e93' 
  AND token = 'NTy7tmNQF5SlMwa1Lqpf+aS0cbETS3gFeJKGaDUMR9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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