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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf60e3793dd40583cc04a128660d34a70fcf82e75ac4b12b24f3fa902e5398e0' 
  AND token = 'Icl21yabDJ1tSR3/qldbCtM13cUCS9oLz8/iIEroOSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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