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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae4983f6f43588df33f4a221dc6b5f28d3cb7d741414c0cc182d2e8d6dfd35c' 
  AND token = 'X0vQdheP7cReGps0/bkA3YeixtKpZcy4aUT63p69szc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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