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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7832e7e388cbe3de21e37b49fbca5f22dd3032f93e52a74968ddccc9164ed7' 
  AND token = 'CpAkjIpy1pUqDZocVdNc07AEJ0Wlzqa48tq0s0IkQys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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