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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4509858332927d513b1675bb8f0d8fcf0d259b199804ae4d1175b893c2a5a5f' 
  AND token = '2N0fRevZ2R8gJdikfuXW9h+KZ47oZ82duCArwecrHdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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