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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5813591c79a98e7816e1e81234bb9550ad74656b1dbd82543c09e9a07575ae0' 
  AND token = 'IPjAfSwbjec/aOjZty7BxtUGXnyqE4QTrfcyNM8e3DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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