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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a773c9dbd749c078971c4393b72050edb0e2722ffa6a464f95e799729dc16a' 
  AND token = '55KnoehCfwB8FOK9KryJ962pNuykRKXLuGku/3vJGTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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