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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de2a3f71a6f14f80965f71a4312014983e968c3e1dda6543d7e2d89ff3b40d8' 
  AND token = 'd6jcN8BFwhujyCnwIo4h2FJKCfApRg8ltu2TUHHlxT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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