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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcff59aae72b68cc46d79d1e1be0759b77ec529aa57b62dce5da714607df91d1' 
  AND token = 'yLvYe2aHKeA246EPm5Fn0xAN+NK5O/AHlkwnrappqg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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