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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5d5c8288a97177c5ca6aa260d35c2f290e81da362fbcdc0c0c92fd1c6a0c0e' 
  AND token = 'sBx+YdWJ8DimzcvtplgKYTXu/zZkfFBmq+emk+6FCyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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