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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9e6c92706e4ba9d84f9b3fa9340648a5fec5a1cecb9bbbe57c1aaf494c84f2' 
  AND token = '9G3mYVBm6INAsr56/EVN+tRyVy8YfbpfjuQDyvWcHZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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