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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c955183393e157572a5a04c6c98b6c6529118852fe0bfdcd4135b12d76945e9' 
  AND token = 'OVaEVf+FTf8rLvddagniEcQL96/4eBMfeuD4Eosw1Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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