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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105f583075d798cb7b1eb0885ff6af3b625a75c934b4fc14b97236313c71733e' 
  AND token = '3xdyfe5z5wWwSZ7Ri9u3ID48YNA2mkidxU2tnoqRmio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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