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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789419608b71df603edf5beea25db5a2e553a32a7027395936a771f3aa6a0d91' 
  AND token = '7+cOtJjdOBmfQtxUOqHV340wfHISHZEiQZn9MXiY5HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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