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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a50a109168da8c78d7dfcd892c4e0897ec859aab4adf423919960170a0805fa' 
  AND token = 'd4A9qGrt+0kVcs4KVfI0bt37hdjqAvUe5HIWsWJCZ0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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