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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6993e4cef530f65014be3e81ef9e483a18731aa266c9e4b2aa1d3579f6a1f0bc' 
  AND token = 'h0yIvURKpu/3HlGHO7kFos4AFGbn8LCNef7b/QgNg8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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