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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97672f71719cf5f69293f9e4b5cf1f455b44364ca6cba9664b4a2d17303b64c4' 
  AND token = 'IKKsZ/t5pTCUyPsCP6heiYMzsysJ5R/zB5W1KPaegbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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