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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dc4d1b7c80c25610a6d08eaab7261aee185b7ba991d91f657e38c8bcd415eb' 
  AND token = 'n/+3PDhP+EyfeZ+QIuSj+DId7pzoHdYFpJ3AI70PhMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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