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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43736a52ccf6bbe122a6897a73998284e0b0d78f5f37ffd32e04b3f1fff19ce3' 
  AND token = 'Hd34kvfZgvxGL3EwMnNbLy0yNqNWhTn5EWq8F1gybZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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