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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fd3fb320e7f31e6807ee1b987111a79c6cd2c6284b7fa966f53e2feb46155d' 
  AND token = 'WOFkHhqqrz3Hxa8SGtvl1a/D1B6e095suAj+fXhuR9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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