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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41c95f883b5cf1d33aebe3fae1d6b9753597aa1bf5767fa26543ef5c10d9aec' 
  AND token = 'HAOHdiXhfg9/hAeL6MijGC9AA+7mQUBtIZ4oRjU1EH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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