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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825771df975edaf9e05e4e1cc9c8f9c7be8053613da03deb64c281c33847d99a' 
  AND token = 'kFb9zwISU4ztzoHt+b3oMzJC1Lu3oLrc5MWr9KO4Apk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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