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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1de719c9f5417f3015d84cfb377c8882614c877bfa58bb80701681e98cafe3f' 
  AND token = '/LhZY1bSFPEKXPVm5rtIk0T/srQhTtGIzOgU1uTcFkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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