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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d9bd0cef5fe643ac760da16a91ad4240164249af6cb3ecdda5aafc5d47d2e1' 
  AND token = 'WLTONtol06xK4dlhujHAW2rVZ4cRuHaCrEW43sUGj5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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