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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60308752198757d23e607e0c06379633e6cb64fdd024faa908fdab5f5f0892f7' 
  AND token = 'vBqslUYIqnWRba1uBeupiXGBpggM9nb5QuBo25D2l5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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