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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8eba57f87388b83a0dfadb9d98fe9398df7b0374edcd8783cf1fbd44d2238b' 
  AND token = '2r1EngZ06L3RE1O/RENEGLpJZyzV9Ardby+kfV57N0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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