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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b6b3aa6d1fa2ea762ec7ca7d542dfa765333b66904f52f310462de8e442b95' 
  AND token = 'Zd58E22pQy7VS3cC77knMrMLfL49dqyEv19xHkUm2F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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