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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6fc69a93961dee146e93b5af1dd68a28ba26d341a367eabd19a019a996cfb2' 
  AND token = 'r/sRWxgtoRc8j/fh7RsJXHLbMhJG+eQGG3Na4BixqJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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